Strain insulator



June 12,1923. 1,458,756

' W. T. GODDARD STRAIN INSULATOR Filed oet, 25 1919 2 sheets-sheet 1June'V 12, 1923.` 1,458,756

w. T. GODDARD Y STRAIN INSULATOR Filed oct. 25, 1919 2 sheets-sheet 2Wafer 776mm@ Patented June 12, 1923;

PATNT OFFICE.e

UNITED STATES WALTER T. GODDARD, OF HAMILTON, ONTARIO, CANADA, ASSIGNOR,BY MESNE AS- SIGNMENTS, TO LOCKE INSULTOR- UORPOHATION. OF BALTIMORE,MARYLAND, A

CORPORATION OF MARYLAND.

STRAIN INSULATOB.

Application led October 25, 1919. Serial No. 333,157.

To all whom t may conccm:

Be it known that I, lVAL'rEn T. GoDDARo, of Hamilton, in the Province ofOntario and Dominion of Canada, have invented certain B new and usefulImprovements in Strain Insulators; and I do hereby declare the followingto be a full, clear, and exact description 'of the same, reference beinghad to the accompanying drawings, forming a part of this specification,and to the reference numerals marked thereon.

My present invention relates to electrical appliances and moreparticularly to insulators of the kind usually employed to support heavyloads on high tension lines and it has for its object to provide animproved construction in which the attached parts of the insulator,usually comprising a silicious frangible element and a metallicattaching element, are held together in a Way that distributes thestrain through the mass of the frangible element. To these and otherends the invention residesin certain improvements and combinations ofparts all as will be hereinafter more fully described, the novelfeatures being pointed out in the claims at the end of thespecification.

In the. drawings Figure l is a side View of a strain insulator unitpartially broken away, constructed in accordance with and illustratingone embodiment of my invention; Figure 2 is an enlarged fragmentary viewof a head of the insulator with the cap removed, together with one halfof the arcing ring;

Figure 3 is an enlarged top insulator with the cap removed;

Figure 4 is a fragmentary section on the view of the 40 line 4-4 ofFigure 3;

Figure 5 is an enlarged top view of the insulator partly broken away; 4

Figure 6- is a horizontal section on the line 6--6 of Figure 4, and

Fi ure 7 is an enlarged fragmentary view showing a detail of the cap.

Similar reference numerals throughout the several views indicate thesame parts.

This invention is an improvement on that described and claimed in myprior and pending application, Serial No. 273,145 filed January 25,1919, which discloses the functions and advantages of a certain methodof lacing the frangible silicious element of a strain insulator to itsconnected part so that the strains will be distributed uniformly throughthe frangible mass to enable it to withstand heavier loads, I willtherefore not go into detail in describing this part ol' the presentdisclosure.

The insulator I have illustrated in the present instance embodies aribbed or flanged cylindrical column l of frangible silicious materialsuch as the ordinary porcelain used in such instances with attaching aring 2 at each end for connection with asupport or with the body to besupported or with another unit of the same nature, as the case may be,these units being often used in multiples and connected together. Asboth ends or heads embodying the rings 2 are alike, a description of onewill suffice for both.

Referring more particularly to Figures 2, 3 and 4, the solid porcelainenlargement 3 at the head of the column 1 is pierced by a number ofannularly disposed staggered apertures 4 and on top of the head isplaced a concentric disc 5 having an embossed perforated center 6, toreceive the ring bolt 7 having the .head 8 engaging beneath the embossedportion. At the margin of the disc 5 is an annular r'ib 8a on the innercircumference of which the disc is pierced by a ring of apertures 9. Aflexible continuous cable 10 having its ends suitably fastened togetherasindicated at 1.1 in Figure 3, is laced through the openings 4 and. 9of the porcelain and the attaching disc so that its loops embrace theportions 11a of the former and extend around the annular rib 8a of thelatter. The said Hexible member can thus slide around and adapt itselfso that it bears with an equal pressure at all points and the strain isdistributed through the mass of the porcelain.

It is desirable` in order to effect a true selfadjustment of theflexible member, that it be subjected to a preliminary strain prior tothe imposition of the stra-ins created by actual use of theinsulator inits intended capacity and 4in the practice of my present invention. Iprovide devices for. doing this which devices are further capable ofimposing a greater seperating strain between the porcelain and itsattaching member without imposing upon the former any tenslle strainwhatever. To these ends, I thread o' er 'te Vnot onlyv to adjust thelacing; in the taut a the two elements 1 and 5 are practicaly rigidlyconnected as ,no relatire ino venient is -oernntted between theni. 1ntightening the screws., it will be noted that their pressure is exertedagainst the portions 11 and in onposition to 'the Contact of the lacing`therewith which acts against the screw on the opposite side. The actualstrain on the porcelain is therefore one of compression which thissubstance is able` to withstand to high degree and isnot in the natureof a tensile `strain such as would be exerted on the portions 11"L itthe lacing was used Without the compression ineinber to resist tie pallimposed by the use of the insulator suspension support. yTheretore7 thescrews7 to Whatever degree they may be tightened elo not impose upon theporcelain any strains detracting from its capability ot withstanding thestrains o? actual use.

The fieiribl@ member or lacing 10 would or- 37 be composed ot inetal andas such. probably constitute the arcing1 point fe insulator, therebyinipairing ite strength. i therefore provide the inet lhc aicinc;- ring14; on the lower portion of the iA sulator head FS which niavle of twosemi-circular sections as shown in Figure G, bolted together 15 by Webs1G connecting' them to semi-circular inner rneuibers 1! jointly orniingband that encircles and secures the ring to the head. 1' then f t overthel head 'an annular cap 18 that entends ,in the central portion oi thedisc 'over lacing 10 complet-ely housin it downwardly into electricalContact with the structure of the arcing ring 14- 'or which is slottedat 19 as shown in Figover the y'ebs 16. 1t. Wili seen ai. cap and thering iguiiy protect the i@ and prevent a passito-ie from Y have with HGS

f' a or tie suspen- Will recogop' cation is possible to supe insulators.Ventionz manner pointed out.` but thej.7 also hold it so A. [rained tothe tllerein newerL elenimt, one o. wir l is f3 br the other through themedium o' tina-ous flexible member laced thrmigh the. apertures in lii`ngiblo element. o means `tively imposed betwee the elements erting aseparatingstrain thereon to sticch the fiexibienienibe and d' ibute thein amou he points of bearing' ot -tleible meunier on said frangibleelement,

2. a strain insulziitor. thc combination with Ya frangible element oiinsulating' man 'terial haring; apertures 'therein and a conH ncctedelement. one of' which is supported bj.' the other through the inediuino'li al coutinuous iexible neinber laced through the apertures in thetrangrible element. oi a de- Vice for stretching said exible member5said device being arranged to act against one ele nient and reactagainst the other to exert causing' the flexible Lneniber to bestretched so that its ap''ilication or" force to the iraneieinent isdistributed.

in a strain insuiator, the combination a frangible element of insulatinginaharing res til-@reinar l a om 1d element. one of which is supportedbj; the otherthroug'h the inediuui o l a continuous flexible ineniberlaced through the roei-tures in the Yrangible element, ot a jaclr e/rcwthreaded into the connected element and bearing; against the trangibleelement 'to l rt a separating;- strain operating to stretch the -eiiibleineinl e and distribute its application of force among its bearing'points.

5. n a strain insu or.' the combination nectel element. one of which issupported by' the other through the. medium of a continuous flexiblemeniber laced througijh the aber 'tures in the trangible element7 oiE anarcingr ring secur d to the 'lirangible element adjacent to the lacingand cap for the Coi'inected element housingu the lacing, andeieotricalij/ Ging i

